"These new results yield ranges for the age of the Universe from 9-12 billion years, and 11-14 billion years, respectively."

9–14billion years

There are varying opinions on the actual age of the universe.
Current estimates range from 12 to 24 billion years. This
is because the age of the universe is such a large number and
therefore, difficult to estimate exactly. Also, no one was alive
to measure the age of the universe so it must be approximated
and figured out based on factors which are prone to error.

Another reason for the differences in values is that depending
on which theory of creation you believe in, the universe has a
different age. The "Big Bang Theory"is currently the
most widely accepted theory of universal creation but some people
believe in theories based on religion, etc.

One figure was very different from the others. This figure
was estimated by the scientist Hubble in 1930. According to his
calculations, the age of the universe was 2 billion years
or less. Even a few years after he came up with this figure it
was known that the actual age of the universe was much older.
Since this time, the estimate has become much more accurate.

"Astronomers used the decay of uranium-238 for the first time to date an ancient star at about 12.5 billion years old.""In the past, cosmologists have supplied the Universe's age. But their estimates range between 9 and 16 billion years because different researchers feed different assumptions into their models."

"The upshot of this new precision is a strong confirmation of the standard inflationary Big Bang scenario, but now with astonishing specificity. We are informed, for example, that the Big Bang occurred 13.7 ±0.2 billion years ago, and that the cmB [cosmic microwave background] is a snapshot of the cosmos 379 ±8
thousand years later."